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Secret key derivation

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This commit is contained in:
SChernykh 2021-06-16 00:10:34 +02:00
parent 8458b4ee39
commit 89bc6418b1
2 changed files with 53 additions and 1 deletions
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51
src/base/tools/cryptonote/Signatures.cpp
View file

@ -77,6 +77,27 @@ static void hash_to_scalar(const void* data, size_t length, ec_scalar& res)
}
static void derivation_to_scalar(const uint8_t* derivation, size_t output_index, ec_scalar& res)
{
struct {
uint8_t derivation[32];
uint8_t output_index[(sizeof(size_t) * 8 + 6) / 7];
} buf;
uint8_t* end = buf.output_index;
memcpy(buf.derivation, derivation, sizeof(buf.derivation));
size_t k = output_index;
while (k >= 0x80) {
*(end++) = (static_cast<uint8_t>(k) & 0x7F) | 0x80;
k >>= 7;
}
*(end++) = static_cast<uint8_t>(k);
hash_to_scalar(&buf, end - reinterpret_cast<uint8_t*>(&buf), res);
}
namespace xmrig {
@ -130,8 +151,9 @@ bool check_signature(const uint8_t* prefix_hash, const uint8_t* pub, const uint8
ge_tobytes((uint8_t*)&buf.comm, &tmp2);
static const ec_point infinity = { { 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} };
if (memcmp(&buf.comm, &infinity, 32) == 0)
if (memcmp(&buf.comm, &infinity, 32) == 0) {
return false;
}
hash_to_scalar(&buf, sizeof(s_comm), c);
sc_sub((uint8_t*)&c, (uint8_t*)&c, (const uint8_t*)&sig.c);
@ -140,5 +162,32 @@ bool check_signature(const uint8_t* prefix_hash, const uint8_t* pub, const uint8
}
bool generate_key_derivation(const uint8_t* key1, const uint8_t* key2, uint8_t* derivation)
{
ge_p3 point;
ge_p2 point2;
ge_p1p1 point3;
if (ge_frombytes_vartime(&point, key1) != 0) {
return false;
}
ge_scalarmult(&point2, key2, &point);
ge_mul8(&point3, &point2);
ge_p1p1_to_p2(&point2, &point3);
ge_tobytes(derivation, &point2);
return true;
}
void derive_secret_key(const uint8_t* derivation, size_t output_index, const uint8_t* base, uint8_t* derived_key)
{
ec_scalar scalar;
derivation_to_scalar(derivation, output_index, scalar);
sc_add(derived_key, base, (uint8_t*) &scalar);
}
} /* namespace xmrig */

3
src/base/tools/cryptonote/Signatures.h
View file

@ -31,6 +31,9 @@ namespace xmrig {
void generate_signature(const uint8_t* prefix_hash, const uint8_t* pub, const uint8_t* sec, uint8_t* sig);
bool check_signature(const uint8_t* prefix_hash, const uint8_t* pub, const uint8_t* sig);
bool generate_key_derivation(const uint8_t* key1, const uint8_t* key2, uint8_t* derivation);
void derive_secret_key(const uint8_t* derivation, size_t output_index, const uint8_t* base, uint8_t* derived_key);
} /* namespace xmrig */